linux-kernel - Re: Fix powerTOP regression with 2.6.39-rc5

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Message-ID: <1304719029.25414.2544.camel@gandalf.stny.rr.com>
Date:	Fri, 06 May 2011 17:57:09 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arjan van de Ven <arjan@...ux.intel.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Fix powerTOP regression with 2.6.39-rc5

On Fri, 2011-05-06 at 14:29 -0700, Arjan van de Ven wrote:
> On 5/6/2011 1:51 PM, Linus Torvalds wrote:
> >
> > You could help fix the tools, and try to avoid the compatibility
> > issues that way. There aren't that many of them.
> 
> once we have a usable library for these (and by usable, I mean that, eg 
> something that someone like Fedora or Ubuntu can package and install)
> I will be more than happy to use it in PowerTOP. Today that does not exist.
> 
> If such library becomes reality soon, then I'll adjust PowerTOP soon as 
> well, and we can remove the padding some time after that even if that is 
> really desired.
> But we're talking 4 bytes here....

I'll work on getting the library out to distros. The 4 bytes is not the
issue, it's the implication that the header is fixed in stone. As we
want to get rid of the pid, and flags as well. Making this in stone just
killed any more progress that ftrace/perf can do in becoming a more
robust tracer.

-- Steve



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